CHAPTER 3 INSTALLATION. Vaisala DMP248

C HAPTER 3 _______________________________________________________________ INSTALLATION

CHAPTER 3

INSTALLATION

Selecting the place of installation

Select a place which gives a true picture of the environment or process; also select a place that is as clean as possible. Air should circulate freely around the sensor.

It is recommended that the sensor head is installed directly in the process through the ball valve assembly. When the ball valve assembly is used, the chamber or the duct does not have to be emptied or shut down for installation or removal of the probe. Install the sensor head transversely against the direction of the process flow.

If the probe head has to be installed aside of the process gas flow or the process is very hot or particularly dirty, the probe can be installed in a “leak-through” position. In this installation, the probe is mounted behind the ball valve assembly and if necessary, a cooling coil and/or a filter can be mounted in between. The flow passes through the sensor head and leaks out through a vent hole in the fitting body enabling a reasonable response time. In hot and dirty processes, a sample system can also be used.

Mounting the transmitter

In F IGURE 3-1 and F IGURE 3-2 , you can see the dimensions of the

DMP248 transmitter:

V AISALA __________________________________________________________________________ 7

OPERATING MANUAL _______________________________________________________________

104

CL ENT

120

NOTE

ø6.5

65

F IGURE 3-1

133

145

Dimensions of the DMP248 electronics housing (in mm).

1.

Always mount the transmitter housing with the cable bushings pointing downwards to ensure IP65 (NEMA4) rating

2.

Make sure that the connection cable has the right thickness

( ∅ 7...10 mm) and that the cable bushing is carefully tightened.

3.

Pay always special attention to closing the transmitter cover carefully and remember to tighten all four screws.

PROBE

PUSHED

DOWN

ø5.5

178

149 cable length

2, 5 or 10 m

PROBE UP clasp nut fitting body adjustment range120 mm non leaking screw (A)

(factory setting) or leak screw (B)

(included in the package)

31

F

IGURE

3-2

ø13.5

Probe dimensions (in mm).

29

R1/2 ISO 7/1

8 _____________________________________________________________________M210492 EN A